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https://www.readbyqxmd.com/read/28635621/the-charge-and-spin-transport-properties-in-hexagonal-silicene-nanorings
#1
Ning Xu, Haiyang Zhang, Xiuqiang Wu, Chen Qiao, Jian-Wen Ding
Based on the tight-binding model, charge and spin transport properties of hexagonal silicene rings are investigated within the nonequilibrium Green's function technique. The effects of external electric, magnetic and exchange fields are taken into account. The calculated results reveal that the hexagonal silicene nanorings act as a controllable spin filter. The near-perfect spin polarization can be achieved by adjusting electric, magnetic and exchange fields. The calculated results offer new possibilities for silicene ring based spin nanodevices...
June 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28635614/advanced-treatment-planning-using-direct-4d-optimisation-for-pencil-beam-scanned-particle-therapy
#2
Kinga Bernatowicz, Ye Zhang, Rosalind Lucy Perrin, Damien Charles Weber, Antony John Lomax
We report on development of a new four-dimensional (4D) optimisation approach for scanned proton beams, which incorporates both irregular motion patterns and the delivery dynamics of the treatment machine into the plan optimiser. Furthermore, we assess the effectiveness of this technique to reduce dose to critical structures in proximity to moving targets, while maintaining effective target dose homogeneity and coverage. The proposed approach has been tested using both a simulated phantom and a clinical liver cancer case, and allows for realistic 4D calculations and optimisation using irregular breathing patterns extracted from e...
June 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28634360/missing-magnetism-in-sr4ru3o10-indication-for-antisymmetric-exchange-interaction
#3
Franziska Weickert, Leonardo Civale, Boris Maiorov, Marcelo Jaime, Myron B Salamon, Emanuela Carleschi, André M Strydom, Rosalba Fittipaldi, Veronica Granata, Antonio Vecchione
Metamagnetism occuring inside a ferromagnetic phase is peculiar. Therefore, Sr4Ru3O10, a T C  = 105 K ferromagnet, has attracted much attention in recent years, because it develops a pronounced metamagnetic anomaly below T C for magnetic fields applied in the crystallographic ab-plane. The metamagnetic transition moves to higher fields for lower temperatures and splits into a double anomaly at critical fields H c1 = 2.3 T and H c2 = 2.8 T, respectively. Here, we report a detailed study of the different components of the magnetization vector as a function of temperature, applied magnetic field, and varying angle in Sr4Ru3O10...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634328/multiple-magnetoelectric-coupling-effect-in-batio3-sr2comoo6-heterostructures
#4
Chang Liu, Wenhui Wan, Sai Gong, Hongbin Zhang, Wei Guo
Due to the demand of controlling magnetism by electric fields for future storage devices, materials with magnetoelectric coupling are of great interests. Based on first-principles calculations, we study the electronic and magnetic properties of a double perovskite Sr2CoMoO6 (SCMO) in a hybrid heterostructure combined with BaTiO3 (BTO) in different polarization states. The calculations show that by introducing ferroelectric state in BTO, SCMO transforms from an antiferromagnetic semiconductor to a half-metal...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634149/a-non-invasive-restraining-system-for-awake-mouse-imaging
#5
Dan Madularu, Axel P Mathieu, Chathura Kumaragamage, Lauren Reynolds, Jamie Near, Cecilia Flores, M Natasha Rajah
BACKGROUND: Preclinical neuroimaging allows for the assessment of brain anatomy, connectivity and function in laboratory animals, such as mice and rats. Most of these studies are performed under anesthesia to avoid movement during the scanning sessions. METHOD: Due to the limitations associated with anesthetized imaging, recent efforts have been made to conduct rodent imaging studies in awake animals, habituated to the restraint systems used in these instances. As of now, only one such system is commercially available for mouse scanning (Animal Imaging Research, Boston, MA, USA) integrating the radiofrequency coil electronics with the restraining element, an approach which, although effective in reducing head motion during awake imaging, has some limitations...
June 17, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28634128/growth-stimulation-and-synthesis-of-lipids-pigments-and-antioxidants-with-magnetic-fields-in-chlorella-kessleri-cultivations
#6
Lenon Medeiros Bauer, Jorge Alberto Vieira Costa, Ana Priscila Centeno da Rosa, Lucielen Oliveira Santos
This study aimed at applying different intensities (30 and 60mT) and exposure times (24 and 1hd(-1)) of MF to cultures of Chlorella kessleri and evaluated their effects on cell growth, proximate composition of biomass, pigment production and antioxidant activity. The condition of 60mT for 1hd(-1) stimulated biomass concentration of 83.2% by comparison with control culture (CC). Besides stimulated 13.7% lipid synthesis, 38.9% chlorophyll a and 59.1% chlorophyll b, 25.0% total carotenoids and antioxidants up to 185...
June 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28633861/optimization-of-magnetic-field-assisted-ultrasonication-for-the-disintegration-of-waste-activated-sludge-using-box-behnken-design-with-response-surface-methodology
#7
Su Guan, Feng Deng, Si-Qi Huang, Shu-Yang Liu, Le-Xian Ai, Pu-Ying She
This study investigated for the first time the feasibility of using a magnetic field for sludge disintegration. Approximately 41.01% disintegration degree (DD) was reached after 30min at 180mT magnetic field intensity upon separate magnetic field treatment. Protein and polysaccharide contents significantly increased. This test was optimized using a Box-Behnken design (BBD) with response surface methodology (RSM) to fit the multiple equation of the DD. The maximum DD was 43.75% and the protein and polysaccharide contents increased to 56...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28632688/high-quality-3-dimensional-1h-magnetic-resonance-spectroscopic-imaging-of-the-prostate-without-endorectal-receive-coil-using-a-semi-laser-sequence
#8
Nassim Tayari, Isabell K Steinseifer, Kirsten M Selnæs, Tone F Bathen, Marnix C Maas, Arend Heerschap
OBJECTIVES: Inclusion of 3-dimensional H magnetic resonance spectroscopic imaging (3D-H-MRSI) in routine multiparametric MRI of the prostate requires good quality spectra and easy interpretable metabolite maps of the whole organ obtained without endorectal coil in clinically feasible acquisition times. We evaluated if a semi-LASER pulse sequence with gradient offset independent adiabaticity refocusing pulses (GOIA-sLASER) for volume selection can meet these requirements. MATERIALS AND METHODS: Thirteen patients with suspicion of prostate cancer and 1 patient known to have prostate cancer were examined at 3 T with a multichannel body-receive coil...
June 19, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28632141/phase-transitions-of-the-dimerized-kane-mele-model-with-without-the-strong-interaction
#9
Tao Du, Yue-Xun Li, Yan Li, He-Lin Lu, Hui Zhang
The dimerized Kane-Mele model with/without the strong interaction is studied using analytical methods. The boundary of the topological phase transition of the model without strong interaction is obtained. Our results show that the occurrence of the transition only depends on dimerized parameter α . From the one-particle spectrum, we obtain the completed phase diagram including the quantum spin Hall (QSH) state and the topologically trivial insulator. Then, using different mean-field methods, we investigate the Mott transition and the magnetic transition of the strongly correlated dimerized Kane-Mele model...
June 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28629225/cortical-plasticity-in-depression
#10
Mariagiovanna Cantone, Alessia Bramanti, Giuseppe Lanza, Manuela Pennisi, Placido Bramanti, Giovanni Pennisi, Rita Bella
Neural plasticity is considered the neurophysiological correlate of learning and memory, although several studies have also noted that it plays crucial roles in a number of neurological and psychiatric diseases. Indeed, impaired brain plasticity may be one of the pathophysiological mechanisms that underlies both cognitive decline and major depression. Moreover, a degree of cognitive impairment is frequently observed throughout the clinical spectrum of mood disorders, and the relationship between depression and cognition is often bidirectional...
May 2017: ASN Neuro
https://www.readbyqxmd.com/read/28628324/activation-parameters-of-self-diffusion-of-aromatic-chiral-molecules-in-external-magnetic-fields
#11
Svetlana G Kozlova, Nikolay B Kompankov, Marina S Zavakhina
The mobility of aromatic chiral molecules 1-phenylethanol and 1-phenyl-1-propanol in liquids was studied by 1H NMR spectroscopy in dependence on the strength of external magnetic field, temperature, and concentration ratio of enantiomers. The data obtained were analyzed using the Arrhenius law. The activation parameters were found to depend on the applied field. This effect is caused by the induced magnetic moments in aromatic molecules. The use of strong magnetic fields seems to be promising for investigation of intermolecular interactions of chiral molecules...
June 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28628224/human-exposure-to-power-frequency-magnetic-fields-up-to-7-6%C3%A2-mt-an-integrated-eeg-fmri-study
#12
Julien Modolo, Alex W Thomas, Alexandre Legros
We assessed the effects of power-line frequency (60 Hz in North America) magnetic fields (MF) in humans using simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI). Twenty-five participants were enrolled in a pseudo-double-blind experiment involving "real" or "sham" exposure to sinusoidal 60 Hz MF exposures delivered using the gradient coil of an MRI scanner following two conditions: (i) 10 s exposures at 3 mT (10 repetitions); (ii) 2 s exposures at 7.6 mT (100 repetitions)...
June 19, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28628029/thermopower-and-thermal-conductivity-in-the-weyl-semimetal-nbp
#13
Ulrike Stockert, Ricardo Donizeth Dos Reis, M O Ajeesh, Sarah J Watzman, Marcus Schmidt, Chandra Shekhar, Joseph P Heremans, Claudia Felser, Michael Baenitz, Michael Nicklas
The Weyl semimetal NbP exhibits an extremely large magnetoresistance (MR) and an ultra-high mobility. The large MR originates from a combination of the nearly perfect compensation between electron- and hole-type charge carriers and the high mobility, which is relevant to the topological band structure. In this work we report on temperature- and field-dependent thermopower and thermal conductivity experiments on NbP. Additionally, we carried out complementary heat capacity, magnetization, and electrical resistivity measurements...
June 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28627118/optical-microresonators-for-sensing-and-transduction-a-materials-perspective
#14
REVIEW
Kevin D Heylman, Kassandra A Knapper, Erik H Horak, Morgan T Rea, Sudheer K Vanga, Randall H Goldsmith
Optical microresonators confine light to a particular microscale trajectory, are exquisitely sensitive to their microenvironment, and offer convenient readout of their optical properties. Taken together, this is an immensely attractive combination that makes optical microresonators highly effective as sensors and transducers. Meanwhile, advances in material science, fabrication techniques, and photonic sensing strategies endow optical microresonators with new functionalities, unique transduction mechanisms, and in some cases, unparalleled sensitivities...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28626920/experimental-verification-of-egsnrc-monte-carlo-calculated-depth-doses-within-a-realistic-parallel-magnetic-field-in-a-polystyrene-phantom
#15
Andrei Ghila, Stephen Steciw, B Gino Fallone, Satyapal Rathee
PURPOSE: Integrating a linac with a magnetic resonance imager (MRI) will revolutionize the accuracy of external beam radiation treatments. Irradiating in the presence of a strong magnetic field, however, will modify the dose distribution. These dose modifications have been investigated previously, mainly using Monte Carlo simulations. The purpose of this work is to experimentally verify the use of the EGSnrc Monte Carlo (MC) package for calculating percent depth doses (PDDs) in a homogeneous phantom, in the presence of a realistic parallel magnetic field...
June 19, 2017: Medical Physics
https://www.readbyqxmd.com/read/28625045/the-size-dependent-heating-of-magnetic-iron-oxide-nanoparticles
#16
Sheng Tong, Christopher A Quinto, Linlin Zhang, Priya Mohindra, Gang Bao
The ability to generate heat under an alternating magnetic field (AMF) makes magnetic iron oxide nanoparticles (MIONs) an ideal heat source for biomedical applications including cancer thermoablative therapy, tissue preservation and remote control of cell function. However, there is a lack of quantitative understanding of the mechanisms governing heat generation of MIONs, and the optimal nanoparticle size for magnetic fluid heating (MFH) applications. Here we show that MIONs with large sizes (> 20nm) have significantly higher specific absorption rate (SAR) than that predicted by the widely used linear theory of MFH...
June 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28624944/effective-oil-removal-from-water-by-magnetically-driven-superhydrophobic-and-oleophilic-magnetic-titania-nanotubes
#17
Manoj Patowary, Rajakumar Ananthakrishnan, Khanindra Pathak
Development of efficient techniques to combat the harmful effects of oil spill is an emerging field, where fabrication of new sorbents for selective removal of oil has become a hot topic for environmental scientists. The present study reports the preparation of superhydrophobic/oleophilic magnetic titania nanotubes via a facile hydrothermal method, followed by the treatment with octadecylamine, as potential magnetically driven sorbent for selective removal of oil from water surface. The magnetic nature (superparamagnetism at 300 K) of the nanotubes enabled magnetic removal of the oil-sorbed material from water surface...
June 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28623372/towards-printable-natural-dielectric-cloaks-via-inverse-scattering-techniques
#18
Loreto Di Donato, Tommaso Isernia, Giuseppe Labate, Ladislau Matekovits
The synthesis of non-magnetic 2D dielectric cloaks as proper solutions of an inverse scattering problem is addressed in this paper. Adopting the relevant integral formulation governing the scattering phenomena, analytic and numerical approaches are exploited to provide new insights on how frequency and direction of arrival of the incoming wave may influence the cloaking mechanism in terms of permittivity distribution within the cover region. In quasi-static (subwavelength) regime a solution is analytically derived in terms of homogeneous artificial dielectric cover with ε < ε 0, which is found to be a necessary and sufficient condition for achieving omnidirectional cloaking...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28621998/hydrodynamic-electron-flow-and-hall-viscosity
#19
Thomas Scaffidi, Nabhanila Nandi, Burkhard Schmidt, Andrew P Mackenzie, Joel E Moore
In metallic samples of small enough size and sufficiently strong momentum-conserving scattering, the viscosity of the electron gas can become the dominant process governing transport. In this regime, momentum is a long-lived quantity whose evolution is described by an emergent hydrodynamical theory. Furthermore, breaking time-reversal symmetry leads to the appearance of an odd component to the viscosity called the Hall viscosity, which has attracted considerable attention recently due to its quantized nature in gapped systems but still eludes experimental confirmation...
June 2, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28621036/coupling-of-magnetic-and-ferroelastic-domains-in-the-organic-inorganic-layered-perovskite-like-c6h5c2h4nh3-2feiicl4
#20
Katsuya Inoue, Sadafumi Nishihara, Yuki Nakayama, Takashi Suzuki, Mohamedally Kurmoo
It is suggested that multiferroic materials coupling ferroelasticity and ferromagnetism show strong magnetoelastic effects as magnetization is induced by mechanical stress or alternately strain induced by applying a magnetic field. These effects were reported for inorganic multiferroics such as LaCoxSr1-xO3. (C6H5C2H4NH3)2FeIICl4 is the first example of an organic-inorganic perovskite to exhibit such effects below the canted antiferromagnetism at TC = 98 K and ferroelasticity at TC = 433 K. This is demonstrated by switching the magnetic hysteresis on and off by uniaxial pressure through the strong coupling of the magnetic and elastic domains...
June 16, 2017: Angewandte Chemie
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